elf2ecoff.c revision 1.29
1 /* $NetBSD: elf2ecoff.c,v 1.29 2013/11/10 17:14:25 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Jonathan Stone 5 * All rights reserved. 6 * Copyright (c) 1995 7 * Ted Lemon (hereinafter referred to as the author) 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* elf2ecoff.c 34 35 This program converts an elf executable to an ECOFF executable. 36 No symbol table is retained. This is useful primarily in building 37 net-bootable kernels for machines (e.g., DECstation and Alpha) which 38 only support the ECOFF object file format. */ 39 40 #if HAVE_NBTOOL_CONFIG_H 41 #include "nbtool_config.h" 42 #endif 43 44 #include <sys/types.h> 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <unistd.h> 49 #include <sys/exec_elf.h> 50 #include <stdio.h> 51 #include <sys/exec_ecoff.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <limits.h> 55 56 #define ISLAST(p) (p->n_un.n_name == 0 || p->n_un.n_name[0] == 0) 57 58 struct sect { 59 unsigned long vaddr; 60 unsigned long len; 61 }; 62 63 struct elf_syms { 64 int nsymbols; 65 Elf32_Sym *elf_syms; 66 off_t stringsize; 67 char *stringtab; 68 }; 69 70 struct ecoff_syms { 71 int nsymbols; 72 struct ecoff_extsym *ecoff_syms; 73 off_t stringsize; 74 char *stringtab; 75 }; 76 77 static int debug = 0; 78 static int needswap; 79 80 static int phcmp(Elf32_Phdr *, Elf32_Phdr *); 81 static char *saveRead(int, off_t, off_t, const char *); 82 static void safewrite(int, const void *, off_t, const char *); 83 static void copy(int, int, off_t, off_t); 84 static void combine(struct sect *, struct sect *, int); 85 static void translate_syms(struct elf_syms *, struct ecoff_syms *); 86 static void elf_symbol_table_to_ecoff(int, int, struct ecoff_exechdr *, 87 off_t, off_t, off_t, off_t); 88 static int make_ecoff_section_hdrs(struct ecoff_exechdr *, 89 struct ecoff_scnhdr *); 90 static void write_ecoff_symhdr(int, struct ecoff_exechdr *, 91 struct ecoff_symhdr *, long, long, long, long); 92 static void pad16(int, int, const char *); 93 static void bswap32_region(int32_t* , int); 94 static void elf_read_syms(struct elf_syms *, int, off_t, off_t, off_t, 95 off_t); 96 97 98 int 99 main(int argc, char **argv) 100 { 101 Elf32_Ehdr ex; 102 Elf32_Phdr *ph; 103 Elf32_Shdr *sh; 104 char *shstrtab; 105 int strtabix, symtabix; 106 size_t i; 107 int pad; 108 struct sect text, data, bss; /* a.out-compatible sections */ 109 110 struct ecoff_exechdr ep; 111 struct ecoff_scnhdr esecs[6]; 112 struct ecoff_symhdr symhdr; 113 114 int infile, outfile; 115 unsigned long cur_vma = ULONG_MAX; 116 int nsecs = 0; 117 int mipsel; 118 119 120 text.len = data.len = bss.len = 0; 121 text.vaddr = data.vaddr = bss.vaddr = 0; 122 123 /* Check args... */ 124 if (argc < 3 || argc > 4) { 125 usage: 126 fprintf(stderr, 127 "Usage: %s <elf executable> <ECOFF executable> [-s]\n", 128 getprogname()); 129 exit(1); 130 } 131 if (argc == 4) { 132 if (strcmp(argv[3], "-s")) 133 goto usage; 134 } 135 /* Try the input file... */ 136 if ((infile = open(argv[1], O_RDONLY)) < 0) 137 err(1, "Can't open %s for read", argv[1]); 138 /* Read the header, which is at the beginning of the file... */ 139 i = read(infile, &ex, sizeof ex); 140 if (i != sizeof ex) 141 err(1, "Short header read from %s", argv[1]); 142 if (ex.e_ident[EI_DATA] == ELFDATA2LSB) 143 mipsel = 1; 144 else if (ex.e_ident[EI_DATA] == ELFDATA2MSB) 145 mipsel = 0; 146 else 147 errx(1, "invalid ELF byte order %d", ex.e_ident[EI_DATA]); 148 #if BYTE_ORDER == BIG_ENDIAN 149 if (mipsel) 150 needswap = 1; 151 else 152 needswap = 0; 153 #elif BYTE_ORDER == LITTLE_ENDIAN 154 if (mipsel) 155 needswap = 0; 156 else 157 needswap = 1; 158 #else 159 #error "unknown endian" 160 #endif 161 162 if (needswap) { 163 ex.e_type = bswap16(ex.e_type); 164 ex.e_machine = bswap16(ex.e_machine); 165 ex.e_version = bswap32(ex.e_version); 166 ex.e_entry = bswap32(ex.e_entry); 167 ex.e_phoff = bswap32(ex.e_phoff); 168 ex.e_shoff = bswap32(ex.e_shoff); 169 ex.e_flags = bswap32(ex.e_flags); 170 ex.e_ehsize = bswap16(ex.e_ehsize); 171 ex.e_phentsize = bswap16(ex.e_phentsize); 172 ex.e_phnum = bswap16(ex.e_phnum); 173 ex.e_shentsize = bswap16(ex.e_shentsize); 174 ex.e_shnum = bswap16(ex.e_shnum); 175 ex.e_shstrndx = bswap16(ex.e_shstrndx); 176 } 177 178 /* Read the program headers... */ 179 ph = (Elf32_Phdr *) saveRead(infile, ex.e_phoff, 180 ex.e_phnum * sizeof(Elf32_Phdr), "ph"); 181 if (needswap) 182 bswap32_region((int32_t*)ph, sizeof(Elf32_Phdr) * ex.e_phnum); 183 /* Read the section headers... */ 184 sh = (Elf32_Shdr *) saveRead(infile, ex.e_shoff, 185 ex.e_shnum * sizeof(Elf32_Shdr), "sh"); 186 if (needswap) 187 bswap32_region((int32_t*)sh, sizeof(Elf32_Shdr) * ex.e_shnum); 188 189 /* Read in the section string table. */ 190 shstrtab = saveRead(infile, sh[ex.e_shstrndx].sh_offset, 191 sh[ex.e_shstrndx].sh_size, "shstrtab"); 192 193 194 /* Look for the symbol table and string table... Also map section 195 * indices to symbol types for a.out */ 196 symtabix = 0; 197 strtabix = 0; 198 for (i = 0; i < ex.e_shnum; i++) { 199 char *name = shstrtab + sh[i].sh_name; 200 if (!strcmp(name, ".symtab")) 201 symtabix = i; 202 else 203 if (!strcmp(name, ".strtab")) 204 strtabix = i; 205 206 } 207 208 /* 209 * Figure out if we can cram the program header into an ECOFF 210 * header... Basically, we can't handle anything but loadable 211 * segments, but we can ignore some kinds of segments. We can't 212 * handle holes in the address space. Segments may be out of order, 213 * so we sort them first. 214 */ 215 216 qsort(ph, ex.e_phnum, sizeof(Elf32_Phdr), 217 (int (*) (const void *, const void *)) phcmp); 218 219 for (i = 0; i < ex.e_phnum; i++) { 220 /* Section types we can ignore... */ 221 if (ph[i].p_type == PT_NULL || ph[i].p_type == PT_NOTE || 222 ph[i].p_type == PT_PHDR || 223 ph[i].p_type == PT_MIPS_REGINFO) { 224 225 if (debug) { 226 fprintf(stderr, " skipping PH %zu type %d " 227 "flags 0x%x\n", 228 i, ph[i].p_type, ph[i].p_flags); 229 } 230 continue; 231 } 232 /* Section types we can't handle... */ 233 else 234 if (ph[i].p_type != PT_LOAD) 235 errx(1, "Program header %zu type %d can't be " 236 "converted", i, ph[i].p_type); 237 /* Writable (data) segment? */ 238 if (ph[i].p_flags & PF_W) { 239 struct sect ndata, nbss; 240 241 ndata.vaddr = ph[i].p_vaddr; 242 ndata.len = ph[i].p_filesz; 243 nbss.vaddr = ph[i].p_vaddr + ph[i].p_filesz; 244 nbss.len = ph[i].p_memsz - ph[i].p_filesz; 245 246 if (debug) { 247 fprintf(stderr, " combinining PH %zu type %d " 248 "flags 0x%x with data, ndata = %ld, " 249 "nbss =%ld\n", i, ph[i].p_type, 250 ph[i].p_flags, ndata.len, nbss.len); 251 } 252 combine(&data, &ndata, 0); 253 combine(&bss, &nbss, 1); 254 } else { 255 struct sect ntxt; 256 257 ntxt.vaddr = ph[i].p_vaddr; 258 ntxt.len = ph[i].p_filesz; 259 if (debug) { 260 fprintf(stderr, " combinining PH %zu type %d " 261 "flags 0x%x with text, len = %ld\n", 262 i, ph[i].p_type, ph[i].p_flags, ntxt.len); 263 } 264 combine(&text, &ntxt, 0); 265 } 266 /* Remember the lowest segment start address. */ 267 if (ph[i].p_vaddr < cur_vma) 268 cur_vma = ph[i].p_vaddr; 269 } 270 271 /* Sections must be in order to be converted... */ 272 if (text.vaddr > data.vaddr || data.vaddr > bss.vaddr || 273 text.vaddr + text.len > data.vaddr || 274 data.vaddr + data.len > bss.vaddr) 275 errx(1, "Sections ordering prevents a.out conversion"); 276 /* If there's a data section but no text section, then the loader 277 * combined everything into one section. That needs to be the text 278 * section, so just make the data section zero length following text. */ 279 if (data.len && text.len == 0) { 280 text = data; 281 data.vaddr = text.vaddr + text.len; 282 data.len = 0; 283 } 284 /* If there is a gap between text and data, we'll fill it when we copy 285 * the data, so update the length of the text segment as represented 286 * in a.out to reflect that, since a.out doesn't allow gaps in the 287 * program address space. */ 288 if (text.vaddr + text.len < data.vaddr) 289 text.len = data.vaddr - text.vaddr; 290 291 /* We now have enough information to cons up an a.out header... */ 292 ep.a.magic = ECOFF_OMAGIC; 293 ep.a.vstamp = 2 * 256 + 10; /* compatible with version 2.10 */ 294 ep.a.tsize = text.len; 295 ep.a.dsize = data.len; 296 ep.a.bsize = bss.len; 297 ep.a.entry = ex.e_entry; 298 ep.a.text_start = text.vaddr; 299 ep.a.data_start = data.vaddr; 300 ep.a.bss_start = bss.vaddr; 301 ep.a.gprmask = 0xf3fffffe; 302 memset(&ep.a.cprmask, 0, sizeof ep.a.cprmask); 303 ep.a.gp_value = 0; /* unused. */ 304 305 if (mipsel) 306 ep.f.f_magic = ECOFF_MAGIC_MIPSEL; 307 else 308 ep.f.f_magic = ECOFF_MAGIC_MIPSEB; 309 310 ep.f.f_nscns = 6; 311 ep.f.f_timdat = 0; /* bogus */ 312 ep.f.f_symptr = 0; 313 ep.f.f_nsyms = sizeof(struct ecoff_symhdr); 314 ep.f.f_opthdr = sizeof ep.a; 315 ep.f.f_flags = 0x100f; /* Stripped, not sharable. */ 316 317 memset(esecs, 0, sizeof(esecs)); 318 319 /* Make ECOFF section headers, with empty stubs for 320 * .rdata/.sdata/.sbss. */ 321 make_ecoff_section_hdrs(&ep, esecs); 322 323 nsecs = ep.f.f_nscns; 324 325 if (needswap) { 326 ep.f.f_magic = bswap16(ep.f.f_magic); 327 ep.f.f_nscns = bswap16(ep.f.f_nscns); 328 ep.f.f_timdat = bswap32(ep.f.f_timdat); 329 ep.f.f_symptr = bswap32(ep.f.f_symptr); 330 ep.f.f_nsyms = bswap32(ep.f.f_nsyms); 331 ep.f.f_opthdr = bswap16(ep.f.f_opthdr); 332 ep.f.f_flags = bswap16(ep.f.f_flags); 333 ep.a.magic = bswap16(ep.a.magic); 334 ep.a.vstamp = bswap16(ep.a.vstamp); 335 ep.a.tsize = bswap32(ep.a.tsize); 336 ep.a.dsize = bswap32(ep.a.dsize); 337 ep.a.bsize = bswap32(ep.a.bsize); 338 ep.a.entry = bswap32(ep.a.entry); 339 ep.a.text_start = bswap32(ep.a.text_start); 340 ep.a.data_start = bswap32(ep.a.data_start); 341 ep.a.bss_start = bswap32(ep.a.bss_start); 342 ep.a.gprmask = bswap32(ep.a.gprmask); 343 bswap32_region((int32_t*)ep.a.cprmask, sizeof(ep.a.cprmask)); 344 ep.a.gp_value = bswap32(ep.a.gp_value); 345 for (i = 0; i < sizeof(esecs) / sizeof(esecs[0]); i++) { 346 esecs[i].s_paddr = bswap32(esecs[i].s_paddr); 347 esecs[i].s_vaddr = bswap32(esecs[i].s_vaddr); 348 esecs[i].s_size = bswap32(esecs[i].s_size); 349 esecs[i].s_scnptr = bswap32(esecs[i].s_scnptr); 350 esecs[i].s_relptr = bswap32(esecs[i].s_relptr); 351 esecs[i].s_lnnoptr = bswap32(esecs[i].s_lnnoptr); 352 esecs[i].s_nreloc = bswap16(esecs[i].s_nreloc); 353 esecs[i].s_nlnno = bswap16(esecs[i].s_nlnno); 354 esecs[i].s_flags = bswap32(esecs[i].s_flags); 355 } 356 } 357 358 /* Make the output file... */ 359 if ((outfile = open(argv[2], O_WRONLY | O_CREAT, 0777)) < 0) 360 err(1, "Unable to create %s", argv[2]); 361 362 /* Truncate file... */ 363 if (ftruncate(outfile, 0)) { 364 warn("ftruncate %s", argv[2]); 365 } 366 /* Write the headers... */ 367 safewrite(outfile, &ep.f, sizeof(ep.f), "ep.f: write"); 368 if (debug) 369 fprintf(stderr, "wrote %zu byte file header.\n", sizeof(ep.f)); 370 371 safewrite(outfile, &ep.a, sizeof(ep.a), "ep.a: write"); 372 if (debug) 373 fprintf(stderr, "wrote %zu byte a.out header.\n", sizeof(ep.a)); 374 375 safewrite(outfile, &esecs, sizeof(esecs[0]) * nsecs, "esecs: write"); 376 if (debug) 377 fprintf(stderr, "wrote %zu bytes of section headers.\n", 378 sizeof(esecs[0]) * nsecs); 379 380 381 pad = ((sizeof ep.f + sizeof ep.a + sizeof esecs) & 15); 382 if (pad) { 383 pad = 16 - pad; 384 pad16(outfile, pad, "ipad: write"); 385 if (debug) 386 fprintf(stderr, "wrote %d byte pad.\n", pad); 387 } 388 /* Copy the loadable sections. Zero-fill any gaps less than 64k; 389 * complain about any zero-filling, and die if we're asked to 390 * zero-fill more than 64k. */ 391 for (i = 0; i < ex.e_phnum; i++) { 392 /* Unprocessable sections were handled above, so just verify 393 * that the section can be loaded before copying. */ 394 if (ph[i].p_type == PT_LOAD && ph[i].p_filesz) { 395 if (cur_vma != ph[i].p_vaddr) { 396 unsigned long gap = ph[i].p_vaddr - cur_vma; 397 char obuf[1024]; 398 if (gap > 65536) 399 errx(1, "Intersegment gap (%ld bytes) " 400 "too large", gap); 401 if (debug) 402 fprintf(stderr, "Warning: %ld byte " 403 "intersegment gap.\n", gap); 404 memset(obuf, 0, sizeof obuf); 405 while (gap) { 406 int count = write(outfile, obuf, 407 (gap > sizeof obuf 408 ? sizeof obuf : gap)); 409 if (count < 0) 410 err(1, "Error writing gap"); 411 gap -= count; 412 } 413 } 414 if (debug) 415 fprintf(stderr, "writing %d bytes...\n", 416 ph[i].p_filesz); 417 copy(outfile, infile, ph[i].p_offset, ph[i].p_filesz); 418 cur_vma = ph[i].p_vaddr + ph[i].p_filesz; 419 } 420 } 421 422 423 if (debug) 424 fprintf(stderr, "writing syms at offset 0x%lx\n", 425 (u_long) ep.f.f_symptr + sizeof(symhdr)); 426 427 /* Copy and translate the symbol table... */ 428 elf_symbol_table_to_ecoff(outfile, infile, &ep, 429 sh[symtabix].sh_offset, sh[symtabix].sh_size, 430 sh[strtabix].sh_offset, sh[strtabix].sh_size); 431 432 /* 433 * Write a page of padding for boot PROMS that read entire pages. 434 * Without this, they may attempt to read past the end of the 435 * data section, incur an error, and refuse to boot. 436 */ 437 { 438 char obuf[4096]; 439 memset(obuf, 0, sizeof obuf); 440 if (write(outfile, obuf, sizeof(obuf)) != sizeof(obuf)) 441 err(1, "Error writing PROM padding"); 442 } 443 444 /* Looks like we won... */ 445 return 0; 446 } 447 448 static void 449 copy(int out, int in, off_t offset, off_t size) 450 { 451 char ibuf[4096]; 452 size_t remaining, cur, count; 453 454 /* Go to the start of the ELF symbol table... */ 455 if (lseek(in, offset, SEEK_SET) < 0) 456 err(1, "copy: lseek"); 457 remaining = size; 458 while (remaining) { 459 cur = remaining; 460 if (cur > sizeof ibuf) 461 cur = sizeof ibuf; 462 remaining -= cur; 463 if ((count = read(in, ibuf, cur)) != cur) 464 err(1, "copy: short read"); 465 safewrite(out, ibuf, cur, "copy: write"); 466 } 467 } 468 469 /* Combine two segments, which must be contiguous. If pad is true, it's 470 okay for there to be padding between. */ 471 static void 472 combine(struct sect *base, struct sect *new, int pad) 473 { 474 475 if (base->len == 0) 476 *base = *new; 477 else 478 if (new->len) { 479 if (base->vaddr + base->len != new->vaddr) { 480 if (pad) 481 base->len = new->vaddr - base->vaddr; 482 else 483 errx(1, "Non-contiguous data can't be " 484 "converted"); 485 } 486 base->len += new->len; 487 } 488 } 489 490 static int 491 phcmp(Elf32_Phdr *h1, Elf32_Phdr *h2) 492 { 493 494 if (h1->p_vaddr > h2->p_vaddr) 495 return 1; 496 else 497 if (h1->p_vaddr < h2->p_vaddr) 498 return -1; 499 else 500 return 0; 501 } 502 503 static char * 504 saveRead(int file, off_t offset, off_t len, const char *name) 505 { 506 char *tmp; 507 int count; 508 off_t off; 509 510 if ((off = lseek(file, offset, SEEK_SET)) < 0) 511 err(1, "%s: fseek", name); 512 if ((tmp = malloc(len)) == NULL) 513 err(1, "%s: Can't allocate %ld bytes", name, (long) len); 514 count = read(file, tmp, len); 515 if (count != len) 516 err(1, "%s: short read", name); 517 return tmp; 518 } 519 520 static void 521 safewrite(int outfile, const void *buf, off_t len, const char *msg) 522 { 523 ssize_t written; 524 525 written = write(outfile, buf, len); 526 if (written != len) 527 err(1, "%s", msg); 528 } 529 530 531 /* 532 * Output only three ECOFF sections, corresponding to ELF psecs 533 * for text, data, and bss. 534 */ 535 static int 536 make_ecoff_section_hdrs(struct ecoff_exechdr *ep, struct ecoff_scnhdr *esecs) 537 { 538 539 ep->f.f_nscns = 6; /* XXX */ 540 541 strcpy(esecs[0].s_name, ".text"); 542 strcpy(esecs[1].s_name, ".data"); 543 strcpy(esecs[2].s_name, ".bss"); 544 545 esecs[0].s_paddr = esecs[0].s_vaddr = ep->a.text_start; 546 esecs[1].s_paddr = esecs[1].s_vaddr = ep->a.data_start; 547 esecs[2].s_paddr = esecs[2].s_vaddr = ep->a.bss_start; 548 esecs[0].s_size = ep->a.tsize; 549 esecs[1].s_size = ep->a.dsize; 550 esecs[2].s_size = ep->a.bsize; 551 552 esecs[0].s_scnptr = ECOFF_TXTOFF(ep); 553 esecs[1].s_scnptr = ECOFF_DATOFF(ep); 554 #if 0 555 esecs[2].s_scnptr = esecs[1].s_scnptr + 556 ECOFF_ROUND(esecs[1].s_size, ECOFF_SEGMENT_ALIGNMENT(ep)); 557 #endif 558 559 esecs[0].s_relptr = esecs[1].s_relptr = esecs[2].s_relptr = 0; 560 esecs[0].s_lnnoptr = esecs[1].s_lnnoptr = esecs[2].s_lnnoptr = 0; 561 esecs[0].s_nreloc = esecs[1].s_nreloc = esecs[2].s_nreloc = 0; 562 esecs[0].s_nlnno = esecs[1].s_nlnno = esecs[2].s_nlnno = 0; 563 564 esecs[1].s_flags = 0x100; /* ECOFF rdata */ 565 esecs[3].s_flags = 0x200; /* ECOFF sdata */ 566 esecs[4].s_flags = 0x400; /* ECOFF sbss */ 567 568 /* 569 * Set the symbol-table offset to point at the end of any 570 * sections we loaded above, so later code can use it to write 571 * symbol table info.. 572 */ 573 ep->f.f_symptr = esecs[1].s_scnptr + esecs[1].s_size; 574 return (ep->f.f_nscns); 575 } 576 577 578 /* 579 * Write the ECOFF symbol header. 580 * Guess at how big the symbol table will be. 581 * Mark all symbols as EXTERN (for now). 582 */ 583 static void 584 write_ecoff_symhdr(int out, struct ecoff_exechdr *ep, 585 struct ecoff_symhdr *symhdrp, long nesyms, 586 long extsymoff, long extstroff, long strsize) 587 { 588 589 if (debug) 590 fprintf(stderr, 591 "writing symhdr for %ld entries at offset 0x%lx\n", 592 nesyms, (u_long) ep->f.f_symptr); 593 594 ep->f.f_nsyms = sizeof(struct ecoff_symhdr); 595 596 memset(symhdrp, 0, sizeof(*symhdrp)); 597 symhdrp->esymMax = nesyms; 598 symhdrp->magic = 0x7009;/* XXX */ 599 symhdrp->cbExtOffset = extsymoff; 600 symhdrp->cbSsExtOffset = extstroff; 601 602 symhdrp->issExtMax = strsize; 603 if (debug) 604 fprintf(stderr, 605 "ECOFF symhdr: symhdr %zx, strsize %lx, symsize %lx\n", 606 sizeof(*symhdrp), strsize, 607 (nesyms * sizeof(struct ecoff_extsym))); 608 609 if (needswap) { 610 bswap32_region(&symhdrp->ilineMax, 611 sizeof(*symhdrp) - sizeof(symhdrp->magic) - 612 sizeof(symhdrp->ilineMax)); 613 symhdrp->magic = bswap16(symhdrp->magic); 614 symhdrp->ilineMax = bswap16(symhdrp->ilineMax); 615 } 616 617 safewrite(out, symhdrp, sizeof(*symhdrp), 618 "writing symbol header"); 619 } 620 621 622 static void 623 elf_read_syms(struct elf_syms *elfsymsp, int in, off_t symoff, off_t symsize, 624 off_t stroff, off_t strsize) 625 { 626 register int nsyms; 627 int i; 628 nsyms = symsize / sizeof(Elf32_Sym); 629 630 /* Suck in the ELF symbol list... */ 631 elfsymsp->elf_syms = (Elf32_Sym *) 632 saveRead(in, symoff, nsyms * sizeof(Elf32_Sym), 633 "ELF symboltable"); 634 elfsymsp->nsymbols = nsyms; 635 if (needswap) { 636 for (i = 0; i < nsyms; i++) { 637 Elf32_Sym *s = &elfsymsp->elf_syms[i]; 638 s->st_name = bswap32(s->st_name); 639 s->st_value = bswap32(s->st_value); 640 s->st_size = bswap32(s->st_size); 641 s->st_shndx = bswap16(s->st_shndx); 642 } 643 } 644 645 /* Suck in the ELF string table... */ 646 elfsymsp->stringtab = (char *) 647 saveRead(in, stroff, strsize, "ELF string table"); 648 elfsymsp->stringsize = strsize; 649 } 650 651 652 static void 653 elf_symbol_table_to_ecoff(int out, int in, struct ecoff_exechdr *ep, 654 off_t symoff, off_t symsize, off_t stroff, off_t strsize) 655 { 656 657 struct elf_syms elfsymtab; 658 struct ecoff_syms ecoffsymtab; 659 register u_long ecoff_symhdr_off, symtaboff, stringtaboff; 660 register u_long nextoff, symtabsize, ecoff_strsize; 661 int nsyms, i; 662 struct ecoff_symhdr symhdr; 663 int padding; 664 665 /* Read in the ELF symbols. */ 666 elf_read_syms(&elfsymtab, in, symoff, symsize, stroff, strsize); 667 668 /* Approximate translation to ECOFF. */ 669 translate_syms(&elfsymtab, &ecoffsymtab); 670 nsyms = ecoffsymtab.nsymbols; 671 672 /* Compute output ECOFF symbol- and string-table offsets. */ 673 ecoff_symhdr_off = ep->f.f_symptr; 674 675 nextoff = ecoff_symhdr_off + sizeof(struct ecoff_symhdr); 676 stringtaboff = nextoff; 677 ecoff_strsize = ECOFF_ROUND(ecoffsymtab.stringsize, 678 (ECOFF_SEGMENT_ALIGNMENT(ep))); 679 680 681 nextoff = stringtaboff + ecoff_strsize; 682 symtaboff = nextoff; 683 symtabsize = nsyms * sizeof(struct ecoff_extsym); 684 symtabsize = ECOFF_ROUND(symtabsize, ECOFF_SEGMENT_ALIGNMENT(ep)); 685 686 /* Write out the symbol header ... */ 687 write_ecoff_symhdr(out, ep, &symhdr, nsyms, symtaboff, 688 stringtaboff, ecoffsymtab.stringsize); 689 690 /* Write out the string table... */ 691 padding = ecoff_strsize - ecoffsymtab.stringsize; 692 safewrite(out, ecoffsymtab.stringtab, ecoffsymtab.stringsize, 693 "string table: write"); 694 if (padding) 695 pad16(out, padding, "string table: padding"); 696 697 698 /* Write out the symbol table... */ 699 padding = symtabsize - (nsyms * sizeof(struct ecoff_extsym)); 700 701 for (i = 0; i < nsyms; i++) { 702 struct ecoff_extsym *es = &ecoffsymtab.ecoff_syms[i]; 703 es->es_flags = bswap16(es->es_flags); 704 es->es_ifd = bswap16(es->es_ifd); 705 bswap32_region(&es->es_strindex, 706 sizeof(*es) - sizeof(es->es_flags) - sizeof(es->es_ifd)); 707 } 708 safewrite(out, ecoffsymtab.ecoff_syms, 709 nsyms * sizeof(struct ecoff_extsym), 710 "symbol table: write"); 711 if (padding) 712 pad16(out, padding, "symbols: padding"); 713 } 714 715 716 717 /* 718 * In-memory translation of ELF symbosl to ECOFF. 719 */ 720 static void 721 translate_syms(struct elf_syms *elfp, struct ecoff_syms *ecoffp) 722 { 723 724 int i; 725 char *oldstringbase; 726 char *newstrings, *nsp; 727 728 int nsyms, idx; 729 730 nsyms = elfp->nsymbols; 731 oldstringbase = elfp->stringtab; 732 733 /* Allocate space for corresponding ECOFF symbols. */ 734 memset(ecoffp, 0, sizeof(*ecoffp)); 735 736 ecoffp->nsymbols = 0; 737 ecoffp->ecoff_syms = malloc(sizeof(struct ecoff_extsym) * nsyms); 738 739 /* we are going to be no bigger than the ELF symbol table. */ 740 ecoffp->stringsize = elfp->stringsize; 741 ecoffp->stringtab = malloc(elfp->stringsize); 742 743 newstrings = (char *) ecoffp->stringtab; 744 nsp = (char *) ecoffp->stringtab; 745 if (newstrings == NULL) 746 errx(1, "No memory for new string table"); 747 /* Copy and translate symbols... */ 748 idx = 0; 749 for (i = 0; i < nsyms; i++) { 750 int binding; 751 752 binding = ELF32_ST_BIND((elfp->elf_syms[i].st_info)); 753 754 /* skip strange symbols */ 755 if (binding == 0) { 756 continue; 757 } 758 /* Copy the symbol into the new table */ 759 strcpy(nsp, oldstringbase + elfp->elf_syms[i].st_name); 760 ecoffp->ecoff_syms[idx].es_strindex = nsp - newstrings; 761 nsp += strlen(nsp) + 1; 762 763 /* translate symbol types to ECOFF XXX */ 764 ecoffp->ecoff_syms[idx].es_type = 1; 765 ecoffp->ecoff_syms[idx].es_class = 5; 766 767 /* Symbol values in executables should be compatible. */ 768 ecoffp->ecoff_syms[idx].es_value = elfp->elf_syms[i].st_value; 769 ecoffp->ecoff_syms[idx].es_symauxindex = 0xfffff; 770 771 idx++; 772 } 773 774 ecoffp->nsymbols = idx; 775 ecoffp->stringsize = nsp - newstrings; 776 } 777 /* 778 * pad to a 16-byte boundary 779 */ 780 static void 781 pad16(int fd, int size, const char *msg) 782 { 783 784 safewrite(fd, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0", size, msg); 785 } 786 787 /* swap a 32bit region */ 788 static void 789 bswap32_region(int32_t* p, int len) 790 { 791 size_t i; 792 793 for (i = 0; i < len / sizeof(int32_t); i++, p++) 794 *p = bswap32(*p); 795 } 796
Indexes created Mon Sep 29 21:09:56 GMT 2025